/* Motion layer: interaction and movement only. */
:root {
  --motion-fast: 170ms;
  --motion-base: 360ms;
  --motion-slow: 720ms;
  --motion-ease: cubic-bezier(.22, 1, .36, 1);
  --motion-ease-soft: cubic-bezier(.2, .75, .25, 1);
}

body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  z-index: 999;
  height: 3px;
  background: linear-gradient(90deg, var(--product), var(--identity), var(--instructions), var(--output));
  transform: scaleX(var(--page-progress, 0));
  transform-origin: left center;
  pointer-events: none;
}

.site-header {
  transition: transform var(--motion-base) var(--motion-ease), opacity var(--motion-base) ease, box-shadow var(--motion-base) ease, background var(--motion-base) ease;
}
.site-header.is-scrolled { box-shadow: 0 20px 52px rgba(0,0,0,.18); }
.site-header.is-hidden { transform: translateY(-130%); opacity: .15; }


.hero-copy-block > * {
  opacity: 0;
  transform: translateY(22px);
  animation: hero-enter 760ms var(--motion-ease) forwards;
}
.hero-copy-block > *:nth-child(1) { animation-delay: 70ms; }
.hero-copy-block > *:nth-child(2) { animation-delay: 150ms; }
.hero-copy-block > *:nth-child(3) { animation-delay: 230ms; }
.hero-copy-block > *:nth-child(4) { animation-delay: 310ms; }
.hero-copy-block > *:nth-child(5) { animation-delay: 390ms; }
@keyframes hero-enter { to { opacity: 1; transform: none; } }

.hero h1 em {
  position: relative;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 97%;
  background-size: 0 6%;
  animation: hero-marker 1s var(--motion-ease) 650ms forwards;
}
@keyframes hero-marker { to { background-size: 100% 6%; } }

[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 30px, 0) scale(.988);
  transition: opacity var(--motion-slow) var(--motion-ease), transform var(--motion-slow) var(--motion-ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

[data-stagger] > * {
  opacity: 0;
  transform: translateY(18px) scale(.985);
  transition: opacity 600ms var(--motion-ease), transform 600ms var(--motion-ease);
  transition-delay: calc(var(--stagger-index, 0) * 70ms);
}
[data-stagger].is-visible > * { opacity: 1; transform: none; }

.button, .copy-button, .text-button, .select-trigger {
  -webkit-tap-highlight-color: transparent;
}
.button, .copy-button, .text-button {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--motion-fast) var(--motion-ease), box-shadow var(--motion-fast) ease, border-color var(--motion-fast) ease, background var(--motion-fast) ease;
}
.button::after, .copy-button::after, .text-button::after {
  content: "";
  position: absolute;
  left: var(--ripple-x, 50%);
  top: var(--ripple-y, 50%);
  width: 12px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: currentColor;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0);
  pointer-events: none;
  z-index: -1;
}
.button.is-rippling::after, .copy-button.is-rippling::after, .text-button.is-rippling::after { animation: ripple 620ms ease-out; }
@keyframes ripple {
  0% { opacity: .15; transform: translate(-50%,-50%) scale(0); }
  100% { opacity: 0; transform: translate(-50%,-50%) scale(30); }
}
.button:active, .copy-button:active, .text-button:active { transform: scale(.965); }

.control-card, .root-section, .output-card, .nested-section {
  transition: transform 300ms var(--motion-ease), box-shadow 300ms ease, border-color 300ms ease, background 300ms ease;
}
.root-section.is-current-section {
  transform: translateY(-2px);
  box-shadow: 0 24px 60px rgba(0,0,0,.12);
  border-color: var(--line-med);
}

.root-section, .output-card {
  position: relative;
  isolation: isolate;
}
.root-section::after, .output-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(320px circle at 50% 50%, rgba(255,255,255,.07), transparent 58%);
  opacity: 0;
  transition: opacity 220ms ease;
  z-index: -1;
  pointer-events: none;
}
.root-section:hover::after, .output-card:hover::after { opacity: 1; }

.field:focus-within > label {
  color: var(--identity);
  transform: translateX(2px);
}
.field > label { transition: color 180ms ease, transform 180ms var(--motion-ease); }

.select-trigger { transition: transform 180ms var(--motion-ease), border-color 180ms ease, background 180ms ease, box-shadow 180ms ease; }
.select-trigger:active { transform: scale(.99); }
.smart-select.open .select-trigger { transform: translateY(-1px); }
.select-option { transition: transform 150ms var(--motion-ease), background 150ms ease, border-color 150ms ease; }
.select-option:hover, .select-option.active { transform: translateX(3px); }

.output-card.is-updated { animation: output-pop 480ms var(--motion-ease); }
@keyframes output-pop {
  0% { transform: scale(.985); border-color: var(--identity); }
  55% { transform: scale(1.006); }
  100% { transform: none; }
}
.copy-button.copied { animation: copy-pop 460ms var(--motion-ease); }
@keyframes copy-pop { 45% { transform: scale(1.09) rotate(-1deg); } }

.validation-summary.valid { animation: validation-ok 520ms var(--motion-ease); }
@keyframes validation-ok { 45% { transform: translateX(3px); } }

.json-details[open] { animation: details-open 360ms var(--motion-ease); }
@keyframes details-open { from { opacity: .55; transform: translateY(-5px); } }



.page-enter {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--canvas);
  pointer-events: none;
  transform-origin: top;
  animation: page-enter 720ms var(--motion-ease) forwards;
}
@keyframes page-enter { to { transform: translateY(-100%); } }

@media (hover: hover) and (pointer: fine) {
  .button:hover, .copy-button:hover { box-shadow: 0 10px 28px rgba(0,0,0,.13); }
  .output-card:hover { transform: translateY(-4px); }
  .root-section:hover { transform: translateY(-3px); }
}

@media (max-width: 680px) {
  body::before { height: 2px; }
  [data-reveal] { transform: translate3d(0, 18px, 0) scale(.994); }
  [data-stagger] > * { transform: translateY(12px); }
  .hero-copy-block > * { animation-duration: 620ms; }
  .root-section:hover, .output-card:hover { transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal], [data-stagger] > *, .hero-copy-block > * { opacity: 1 !important; transform: none !important; }
  .site-header.is-hidden { transform: none; opacity: 1; }
}